Game Server RAM vs CPU: Which Matters More? (2026)

For most game servers, RAM is what decides whether the server runs at all, and single core CPU speed decides how smoothly it runs. Run out of RAM and the server crashes, rolls back or refuses to load the world. Run short on CPU and everyone lags at the same moment while memory sits half empty. Memory heavy games include ARK, Palworld and Rust. Factorio, Minecraft and Space Engineers are CPU heavy. Satisfactory and 7 Days to Die lean hard on both.

What does RAM do on a game server?

RAM holds everything the server has loaded: the map, every base and placed object, creatures and AI, player inventories, and every mod. Memory is a capacity limit, not a speed dial. As long as the world fits, adding more RAM does nothing for performance. When it does not fit, things go wrong quickly:

The server crashes with an out of memory error, often mid session.
Java games (Minecraft, Project Zomboid, Necesse, StarMade) stutter as garbage collection runs constantly, then throw OutOfMemoryError.
Worlds roll back to the last save after a crash.
A big map or modpack fails to load at all.

Memory use also grows over time. A Rust map gets heavier through a wipe as players build, a Palworld world gets heavier as bases fill with Pals, and a Satisfactory factory gets heavier with every machine. That is why a server that was fine in week one can fall over in week four.

What does the CPU do on a game server?

The CPU runs the simulation. Every tick, the server moves creatures, resolves combat, runs machines, processes physics and sends updates to players. Most game servers do this core work on one main thread, so a single fast core matters far more than a pile of slow ones. Extra cores help with side jobs like generating chunks, saving and networking, but they cannot make the main loop faster.

When the CPU falls behind, ticks take longer than they should. Players feel it as rubberbanding, delayed actions, doors that open a second late and machines that slow down. The key sign is that everyone lags together, at the same moments, and it gets worse with activity rather than with time. Our best CPU for a game server guide goes deeper on clock speed versus core count, and what tick rate means explains why ticks matter.

Satisfactory factory with conveyor belts and machines, a world the server simulates every tick

Which games need more RAM and which need more CPU?

This is what tends to run out first on a typical private server:

Game	Usually runs out first	Why
ARK: Survival Ascended	RAM	Large maps take many gigabytes before anyone joins, dinos and structures add more
Palworld	RAM	Bases full of Pals grow memory, and the server has a known memory leak
Rust	RAM, then CPU	Entity count climbs through a wipe, plugins add more
Conan Exiles	RAM	Big bases with hundreds of placeables, thralls and mods
Minecraft: Java	CPU, then RAM for modpacks	The main tick is single threaded, modpacks need memory
Factorio	CPU	The whole factory updates 60 times a second on one core
Space Engineers	CPU	Every block on every grid is physics, block count matters more than players
Satisfactory	Both	The whole factory is simulated while anyone is online, and late saves need 12 to 16 GB
7 Days to Die	Both	Random worlds and hordes use memory, single core speed drives the simulation
Project Zomboid	Both	Java heap for the loaded map, CPU for zombies and vehicles
Valheim	CPU	Light on memory, but heavy building in one area causes stutter
Terraria	Neither, usually	Vanilla runs on 2 GB, big mod lists need more

As a rough rule, games with huge persistent worlds and lots of saved objects are memory bound, and games with heavy per tick simulation (factories, physics, many AI) are CPU bound. For per game memory numbers, see how much RAM a game server needs.

How do I tell if my server is short on RAM or CPU?

Look at what the server reports and how the lag feels.

Symptom	Likely cause
Memory graph sits at the plan limit, then the server crashes	RAM
`OutOfMemoryError` or out of memory in the console	RAM
World rolls back after a crash	RAM, usually
Everyone rubberbands at the same time, memory well below the limit	CPU
Minecraft prints `Can't keep up! Is the server overloaded?`	CPU (or a world heavy with entities)
Factorio UPS drops below 60, Rust server FPS drops	CPU
Only one or two players lag, others are fine	Their connection, not the server
Lag only during saves or autosaves	Disk or save size

On a hosted server, the control panel shows memory and CPU use live. Watch both during your busiest moment, like a blood moon horde, a raid or a factory expansion. If memory climbs toward the limit, you need RAM. If memory has room but CPU is pinned at the busy moment, you have a CPU problem. Our why is my game server lagging guide walks through the rest of the checklist, including network problems.

Does more RAM fix lag?

Only if the lag comes from running out of memory. If a Minecraft server with 6 GB is using 3 GB, moving to 12 GB will not change TPS at all. Giving Java far more heap than it needs can even make garbage collection pauses longer.

More RAM does help when:

The memory graph touches the plan limit during play.
You are adding a modpack, a big mod list or a larger map.
The group is growing and spreading out across the map.
The world has grown over weeks and crashes have started.

How do I reduce CPU load without changing hardware?

CPU load comes from what the server simulates, so cut the work:

Lower view or simulation distance. In Minecraft, simulation-distance in server.properties affects CPU far more than view-distance.
Cap entity counts. Fewer animals in a farm, fewer Pals per base, fewer tamed dinos, lower zombie population.
Clean up the world. Abandoned grids in Space Engineers, dropped items, decayed bases in Rust.
Remove heavy mods or plugins. One badly written mod can take more CPU than the whole base game.
Keep players together. Players spread across the map force the server to simulate many areas at once.
Restart regularly for games that slow down the longer they run. See how often to restart a game server.

What should I look for when choosing a plan?

Size memory to the world you will have in a month, not the one you start with, and leave some headroom. For CPU, look for a host that runs modern, high clock speed processors, because single core speed is what the main thread needs. Core count beyond two or three rarely matters for one game server.

FAQ

Is RAM or CPU more important for a game server?

Both matter, in different ways. RAM is a limit you must not cross or the server crashes, while single core CPU speed decides how smoothly the simulation runs once the world fits in memory.

Why is my server lagging when it has free RAM?

Because the bottleneck is elsewhere, usually the CPU main thread, too many entities or a heavy mod. Free memory means more RAM will not help.

Do more CPU cores make a game server faster?

Rarely. Most game servers run their simulation on one main thread, so a faster core helps much more than extra cores.

How much RAM does a game server need?

Light games like Terraria or Minecraft with a few friends run on 2 to 4 GB. Big survival games like ARK, Palworld or Satisfactory late game want 12 to 16 GB or more.

Does Minecraft use more CPU or RAM?

A vanilla or Paper server is limited by single core CPU speed first. Big modpacks also need 6 to 8 GB or more of RAM.

The easy option

If you would rather not guess, our plans are sized by memory for each game, with recommendations on every game page for different group sizes, and you can upgrade or downgrade any time as the world grows. Every plan includes DDoS protection, full file access and 24/7 support from real people, and new customers get 50% off the first month on monthly plans. Start with the game list or read choosing a plan.